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What Causes a Motorcycle to Emit Black Smoke?

1 Answers

KingstonMarie

07/30/25 8:48am

The reasons for a motorcycle emitting black smoke are: 1. Clogged air filter; 2. Spark plug issues such as misfiring or weak spark; 3. Ignition circuit problems causing slight misfiring; 4. Fuel level too high leading to excessively rich air-fuel mixture; 5. Incomplete combustion. Daily maintenance methods for motorcycles: 1. During the break-in period, keep the motorcycle idle at 100 rpm; 2. Match the gear with the speed; 3. When needing to brake due to an obstacle ahead, release the throttle, step on the rear brake with your right foot, and gently apply the front brake with your right hand; 4. Regularly inspect the spark plug; 5. When installing a new spark plug, hand-tighten it until it can't be turned anymore, then use a spark plug socket to tighten it an additional quarter to half turn; 6. Regularly lubricate the chain.

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